Using MySQL delete state you can delete table data. With a single delete statement you can delete one or more tables data at a time.
Example of MySQL DELETE:
DELETE FROM users WHERE status = 0;
For multiple table:
DELETE users, orders FROM users, orders WHERE users.user_id = orders.user_id AND users.status = 0;
MySQL TRUNCATE TABLE allows you to delete all data from a table. There is no condition in TRUNCATE TABLE clause.
TRUNCATE TABLE tbl_name;
Same as UPDATE clause you can delete using JOIN query.
DELETE users, orders FROM orders INNER JOIN users ON orders.user_id = users.user_id WHERE orders.status = 0
ON DELETE CASCADE
Using MySQL ON DELETE CASCADE you can delete data from child tables automatically when you delete the data from the parent table depends on foreign key.
While creating a table you have to use this syntax:
CREATE TABLE user ( id INT NOT NULL, name VARCHAR(100), PRIMARY KEY (id) ) ENGINE=INNODB; CREATE TABLE marks ( id INT, parent_id INT, INDEX par_ind (parent_id), FOREIGN KEY (parent_id) REFERENCES parent(id) ON DELETE CASCADE ) ENGINE=INNODB;
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